In people with Parkinson's disease, the brain does not have enough of a chemical called dopamine, which helps control movement. This makes it hard for people to move their bodies the way they want to.

Carbidopa, levodopa, and entacapone are medicines that work together to help people with Parkinson's disease.

Levodopa is a medicine that turns into dopamine in the brain. When levodopa is used by itself, it gets broken down too quickly, before it can reach the brain. Carbidopa and entacapone work to block the breakdown of levodopa so that more dopamine can get to the brain. This helps people with Parkinson's disease move more easily.